ab6aec1997-02-11Fredrik Hübinette (Hubbe) #include <config.h>
e3cb4b1997-04-03Mirar (Pontus Hagland) /* **! module Image **! class font
b9284c1997-04-09Mirar (Pontus Hagland) **! **! Short technical documentation on a font file:
f311411997-04-18Mirar (Pontus Hagland) **! <pre>
b9284c1997-04-09Mirar (Pontus Hagland) **! struct file_head **! { **! unsigned INT32 cookie; - 0x464f4e54 **! unsigned INT32 version; - 1 **! unsigned INT32 chars; - number of chars **! unsigned INT32 height; - height of font **! unsigned INT32 baseline; - font baseline **! unsigned INT32 o[1]; - position of char_head's **! } *fh; **! struct char_head **! { **! unsigned INT32 width; - width of this character **! unsigned INT32 spacing; - spacing to next character **! unsigned char data[1]; - pixmap data (1byte/pixel) **! } *ch;
f311411997-04-18Mirar (Pontus Hagland) **! </pre>
b9284c1997-04-09Mirar (Pontus Hagland) **!
e3cb4b1997-04-03Mirar (Pontus Hagland) */
f311411997-04-18Mirar (Pontus Hagland) /* $Id: font.c,v 1.8 1997/04/18 06:47:22 mirar Exp $ */
ab6aec1997-02-11Fredrik Hübinette (Hubbe)  #include "global.h" #include <sys/types.h> #include <sys/stat.h> #ifdef HAVE_FCNTL_H #include <fcntl.h> #endif #ifdef HAVE_SYS_FCNTL_H #include <sys/fcntl.h> #endif #include <netinet/in.h> #include <errno.h> #include "config.h" #include "stralloc.h" #include "types.h"
bb55f81997-03-16Fredrik Hübinette (Hubbe) #include "pike_macros.h"
ab6aec1997-02-11Fredrik Hübinette (Hubbe) #include "object.h" #include "constants.h" #include "interpret.h" #include "svalue.h" #include "array.h" #include "threads.h"
9c6f7d1997-04-15Fredrik Hübinette (Hubbe) #include "builtin_functions.h"
ab6aec1997-02-11Fredrik Hübinette (Hubbe)  #include "image.h" #ifdef HAVE_MMAP #include <sys/mman.h> #endif static struct program *font_program; extern struct program *image_program; #define THIS (*(struct font **)(fp->current_storage)) #define THISOBJ (fp->current_object) struct font { unsigned long height; /* height of character rectangles */ unsigned long baseline; /* baseline of characters */ #ifdef HAVE_MMAP unsigned long mmaped_size; /* if 0 - not mmaped: just free() mem */ #endif void *mem; /* pointer to mmaped/malloced memory */ unsigned long chars; /* number of characters */ float xspacing_scale; /* Fraction of spacing to use */ float yspacing_scale; /* Fraction of spacing to use */ enum { J_LEFT, J_RIGHT, J_CENTER } justification; struct _char { unsigned long width; /* character rectangle has this width in pixels */ unsigned long spacing; /* pixels to next character */ unsigned char *pixels; /* character rectangle */ } charinfo [1]; /* many!! */ }; /***************** init & exit *********************************/ static inline void free_font_struct(struct font *font) { if (font) { if (font->mem) { #ifdef HAVE_MMAP munmap(font->mem,font->mmaped_size); #else free(font->mem); #endif } free(font); } } static void init_font_struct(struct object *o) { THIS=NULL; } static void exit_font_struct(struct object *obj) { free_font_struct(THIS); THIS=NULL; } /***************** internals ***********************************/ static inline int my_read(int from, char *buf, int towrite) { int res; while((res = read(from, buf, towrite)) < 0) { switch(errno) { case EAGAIN: case EINTR: continue; default: res = 0; return 0; } } return res; } static inline long file_size(int fd) { struct stat tmp; int res; if(!fstat(fd, &tmp)) return res = tmp.st_size; return -1; }
9c6f7d1997-04-15Fredrik Hübinette (Hubbe) static inline void write_char(struct _char *ci, rgb_group *pos, INT32 xsize, INT32 height)
ab6aec1997-02-11Fredrik Hübinette (Hubbe) { rgb_group *nl; INT32 x,y; unsigned char *p; p=ci->pixels; for (y=height; y>0; y--) { nl=pos+xsize; for (x=(INT32)ci->width; x>0; x--) { register char c; c=255-*p; if (pos->r==0) pos->r=pos->g=pos->b=c; else if (pos->r+c>255) pos->r=pos->g=pos->b=255; else { pos->r+=c; pos->g+=c; pos->b+=c; } pos++; p++; } pos=nl; } } /***************** methods *************************************/
b9284c1997-04-09Mirar (Pontus Hagland) /* **! method object|int load(string filename) **! Loads a font file to this font object. **! returns zero upon failure, font object upon success **! arg string filename **! Font file **! see also: write */
ab6aec1997-02-11Fredrik Hübinette (Hubbe)  void font_load(INT32 args) { int fd; if (args<1 || sp[-args].type!=T_STRING) error("font->read: illegal or wrong number of arguments\n"); if (THIS) { free_font_struct(THIS); THIS=NULL; } do { #ifdef FONT_DEBUG fprintf(stderr,"FONT open '%s'\n",sp[-args].u.string->str); #endif fd = open(sp[-args].u.string->str,O_RDONLY); } while(fd < 0 && errno == EINTR); if (fd >= 0) { long size; struct font *new; size = file_size(fd); if (size > 0) { new=THIS=(struct font *)xalloc(sizeof(struct font)); THREADS_ALLOW(); #ifdef HAVE_MMAP new->mem = mmap(0,size,PROT_READ,MAP_SHARED,fd,0); new->mmaped_size=size; #else new->mem = malloc(size); if ((new->mem) && (!my_read(fd,new->mem,size))) { free(new->mem); new->mem = NULL; } #endif THREADS_DISALLOW(); if (THIS->mem) { int i; struct file_head { unsigned INT32 cookie; unsigned INT32 version; unsigned INT32 chars; unsigned INT32 height; unsigned INT32 baseline; unsigned INT32 o[1]; } *fh; struct char_head { unsigned INT32 width; unsigned INT32 spacing; unsigned char data[1]; } *ch; #ifdef FONT_DEBUG fprintf(stderr,"FONT mapped ok\n"); #endif fh=(struct file_head*)THIS->mem; if (ntohl(fh->cookie)==0x464f4e54) /* "FONT" */ { #ifdef FONT_DEBUG fprintf(stderr,"FONT cookie ok\n"); #endif if (ntohl(fh->version)==1) { unsigned long i; #ifdef FONT_DEBUG fprintf(stderr,"FONT version 1\n"); #endif THIS->chars=ntohl(fh->chars); new=malloc(sizeof(struct font)+ sizeof(struct _char)*(THIS->chars-1)); new->mem=THIS->mem; #ifdef HAVE_MMAP new->mmaped_size=THIS->mmaped_size; #endif new->chars=THIS->chars; new->xspacing_scale = 1.0; new->yspacing_scale = 1.0; new->justification = J_LEFT; free(THIS); THIS=new; THIS->height=ntohl(fh->height); THIS->baseline=ntohl(fh->baseline); for (i=0; i<THIS->chars; i++) { if (i*sizeof(INT32)<(unsigned long)size && ntohl(fh->o[i])<(unsigned long)size && ! ( ntohl(fh->o[i]) % 4) ) /* must be aligned */ { ch=(struct char_head*) ((char *)(THIS->mem)+ntohl(fh->o[i])); THIS->charinfo[i].width = ntohl(ch->width); THIS->charinfo[i].spacing = ntohl(ch->spacing); THIS->charinfo[i].pixels = ch->data; } else /* illegal <tm> offset or illegal align */ { #ifdef FONT_DEBUG fprintf(stderr,"FONT failed on char %02xh %d '%c'\n", i,i,i); #endif free_font_struct(new); THIS=NULL; pop_n_elems(args); push_int(0); return; } } close(fd); pop_n_elems(args); THISOBJ->refs++; push_object(THISOBJ); /* success */ #ifdef FONT_DEBUG fprintf(stderr,"FONT successfully loaded\n"); #endif return; } /* wrong version */ #ifdef FONT_DEBUG else fprintf(stderr,"FONT unknown version\n"); #endif } /* wrong cookie */ #ifdef FONT_DEBUG else fprintf(stderr,"FONT wrong cookie\n"); #endif } /* mem failure */ #ifdef FONT_DEBUG else fprintf(stderr,"FONT mem failure\n"); #endif free_font_struct(THIS); THIS=NULL; } /* size failure */ #ifdef FONT_DEBUG else fprintf(stderr,"FONT size failure\n"); #endif close(fd); } /* fd failure */ #ifdef FONT_DEBUG else fprintf(stderr,"FONT fd failure\n"); #endif pop_n_elems(args); push_int(0); return; }
b9284c1997-04-09Mirar (Pontus Hagland) /* **! method object write(string text,...) **! Writes some text; thus creating an image object **! that can be used as mask or as a complete picture. **! returns an <ref>Image::image</ref> object **! arg string text, ... **! One or more lines of text. **! see also: text_extents, load, image::paste_mask, image::paste_alpha_color */
ab6aec1997-02-11Fredrik Hübinette (Hubbe) void font_write(INT32 args) { struct object *o; struct image *img; INT32 xsize=0,i,maxwidth,c,maxwidth2,j; int *width_of; if (!THIS) error("font->write: no font loaded\n"); maxwidth2=0; width_of=(int *)malloc((args+1)*sizeof(int)); if(!width_of) error("Out of memory\n"); for (j=0; j<args; j++) { if (sp[j-args].type!=T_STRING) error("font->write: illegal argument(s)\n"); xsize = 0; maxwidth = 0; for (i = 0; i < sp[j-args].u.string->len; i++) { c=EXTRACT_UCHAR(sp[j-args].u.string->str+i); if (c < (INT32)THIS->chars) { if (xsize + (signed long)THIS->charinfo[c].width > maxwidth) maxwidth = xsize + THIS->charinfo[c].width; xsize+=(signed long)((float)THIS->charinfo[c].spacing *(float)THIS->xspacing_scale); } } if (xsize>maxwidth) maxwidth=xsize; width_of[j]=maxwidth; if (maxwidth>maxwidth2) maxwidth2=maxwidth; }
e709751997-03-12Fredrik Hübinette (Hubbe)  o = clone_object(image_program,0);
ab6aec1997-02-11Fredrik Hübinette (Hubbe)  img = ((struct image*)o->storage); img->xsize = maxwidth2; if(args>1) img->ysize = THIS->height+((double)THIS->height*(double)(args-1)*(double)THIS->yspacing_scale)+1; else img->ysize = THIS->height+1; img->rgb.r=img->rgb.g=img->rgb.b=255; img->img=malloc(img->xsize*img->ysize*sizeof(rgb_group)); if (!img) { free_object(o); free(width_of); error("Out of memory\n"); } MEMSET(img->img,0,img->xsize*img->ysize*sizeof(rgb_group)); for (j=0; j<args; j++) { switch(THIS->justification) { case J_LEFT: xsize = 0; break; case J_RIGHT: xsize = img->xsize-width_of[j]-1; break; case J_CENTER: xsize = img->xsize/2-width_of[j]/2-1; break; } if(xsize<0) xsize=0; for (i = 0; i < (int)sp[j-args].u.string->len; i++) { c=EXTRACT_UCHAR(sp[j-args].u.string->str+i); if ( c < (INT32)THIS->chars) { write_char(THIS->charinfo+c, (img->img+xsize)+(img->xsize*(int)(j*THIS->height *THIS->yspacing_scale)), img->xsize, THIS->height); xsize += THIS->charinfo[c].spacing*THIS->xspacing_scale; } } } free(width_of); pop_n_elems(args); push_object(o); }
b9284c1997-04-09Mirar (Pontus Hagland) /* **! method int height() **! returns font height **! see also: baseline, text_extents */
ab6aec1997-02-11Fredrik Hübinette (Hubbe) void font_height(INT32 args) { pop_n_elems(args); if (THIS) push_int(THIS->height); else push_int(0); }
b9284c1997-04-09Mirar (Pontus Hagland) /*
f311411997-04-18Mirar (Pontus Hagland) **! method array(int) text_extents(string text,...)
b9284c1997-04-09Mirar (Pontus Hagland) **! Calculate extents of a text-image, **! that would be created by calling <ref>write</ref> **! with the same arguments. **! returns an array of width and height **! arg string text, ... **! One or more lines of text. **! see also: write, height, baseline */
ab6aec1997-02-11Fredrik Hübinette (Hubbe) void font_text_extents(INT32 args) { INT32 xsize,i,maxwidth,c,maxwidth2,j; if (!THIS) error("font->text_extents: no font loaded\n"); maxwidth2=0; for (j=0; j<args; j++) { if (sp[j-args].type!=T_STRING) error("font->text_extents: illegal argument(s)\n"); xsize = 0; maxwidth = 0; for (i = 0; i < sp[j-args].u.string->len; i++) { c=EXTRACT_UCHAR(sp[j-args].u.string->str+i); if (c < (INT32)THIS->chars) { if (xsize + (signed long)THIS->charinfo[c].width > maxwidth) maxwidth = xsize + THIS->charinfo[c].width; xsize += THIS->charinfo[c].spacing*THIS->xspacing_scale; } } if (xsize>maxwidth) maxwidth=xsize; if (maxwidth>maxwidth2) maxwidth2=maxwidth; }
b9284c1997-04-09Mirar (Pontus Hagland)  pop_n_elems(args);
ab6aec1997-02-11Fredrik Hübinette (Hubbe)  push_int(maxwidth2); push_int(args * THIS->height * THIS->yspacing_scale);
b9284c1997-04-09Mirar (Pontus Hagland)  f_aggregate(2);
ab6aec1997-02-11Fredrik Hübinette (Hubbe) }
b9284c1997-04-09Mirar (Pontus Hagland)  /* **! method void set_xspacing_scale(float scale) **! method void set_yspacing_scale(float scale) **! Set spacing scale to write characters closer **! or more far away. This does not change scale **! of character, only the space between them. **! arg float scale **! what scale to use */
ab6aec1997-02-11Fredrik Hübinette (Hubbe) void font_set_xspacing_scale(INT32 args) { if(!THIS) error("font->set_xspacing_scale(FLOAT): No font loaded.\n"); if(!args) error("font->set_xspacing_scale(FLOAT): No argument!\n"); if(sp[-args].type!=T_FLOAT) error("font->set_xspacing_scale(FLOAT): Wrong type of argument!\n"); THIS->xspacing_scale = (double)sp[-args].u.float_number; /*fprintf(stderr, "Setting xspacing to %f\n", THIS->xspacing_scale);*/ if(THIS->xspacing_scale < 0.0) THIS->xspacing_scale=0.1; pop_stack(); } void font_set_yspacing_scale(INT32 args) { if(!THIS) error("font->set_yspacing_scale(FLOAT): No font loaded.\n"); if(!args) error("font->set_yspacing_scale(FLOAT): No argument!\n"); if(sp[-args].type!=T_FLOAT) error("font->set_yspacing_scale(FLOAT): Wrong type of argument!\n"); THIS->yspacing_scale = (double)sp[-args].u.float_number; /*fprintf(stderr, "Setting yspacing to %f\n", THIS->yspacing_scale);*/ if(THIS->yspacing_scale <= 0.0) THIS->yspacing_scale=0.1; pop_stack(); }
b9284c1997-04-09Mirar (Pontus Hagland)  /* **! method int baseline() **! returns font baseline (pixels from top) **! see also: height, text_extents */
ab6aec1997-02-11Fredrik Hübinette (Hubbe) void font_baseline(INT32 args) { pop_n_elems(args); if (THIS) push_int(THIS->baseline); else push_int(0); } void font_set_center(INT32 args) { pop_n_elems(args); if(THIS) THIS->justification=J_CENTER; } void font_set_right(INT32 args) { pop_n_elems(args); if(THIS) THIS->justification=J_RIGHT; } void font_set_left(INT32 args) { pop_n_elems(args); if(THIS) THIS->justification=J_LEFT; } /***************** global init etc *****************************/ /* int load(string filename); // load font file, true is success object write(string text); // new image object int height(); // font heigth int baseline(); // font baseline */ void init_font_programs(void) { start_new_program(); add_storage(sizeof(struct font*)); add_function("load",font_load,
50a0d11997-03-09Henrik Grubbström (Grubba)  "function(string:object|int)",0);
ab6aec1997-02-11Fredrik Hübinette (Hubbe)  add_function("write",font_write, "function(string:object)",0); add_function("height",font_height, "function(:int)",0); add_function("baseline",font_baseline, "function(:int)",0); add_function("extents",font_text_extents, "function(string ...:array(int))",0); add_function("set_x_spacing",font_set_xspacing_scale, "function(float:void)",0); add_function("set_y_spacing",font_set_yspacing_scale, "function(float:void)",0); add_function("center", font_set_center, "function(void:void)", 0); add_function("left", font_set_left, "function(void:void)", 0); add_function("right", font_set_right, "function(void:void)", 0); set_init_callback(init_font_struct); set_exit_callback(exit_font_struct); font_program=end_program(); add_program_constant("font",font_program, 0); } void exit_font(void) { if(font_program) { free_program(font_program); font_program=0; } }